Fans of Bones can expect an extra special treat this week as Kathy Reichs - the author and forensic anthropologist who created Temperance Brennan - pens her first ever episode of the Fox crime drama. 'The Witch In The Wardrobe' sees Brennan (Emily Deschanel) and Booth (David Boreanaz) delving into the world of Wicca after two bodies are discovered in a cabin in the woods. We caught up with Reichs as she chatted about the differences between writing books and television, whether she'll ever make another guest appearance, and her thoughts on that Booth/Brennan romance...

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Where did the story for 'Witch In The Wardrobe' come from?
"It came from a combination of different things. Whenever I write a novel, I always bring different aspects of different cases together and blend them together into one story. I've had cases where bodies were found covered in some kind of melted goop from a fire, so that kind of figured into it. I've had cases where bones were found in coffins or storage lockers or trunks that probably belonged to fraternities or things like that, they were dressed in odd clothing or something, so elements of that came into the story."

Do you view book Tempe and television Tempe as two separate people?
"I really don't. I think of TV Tempe as an earlier point in book Tempe's life. She's 30-something rather than 40-something, she's unmarried, she's living in Washington - which I find very appropriate because that's where I started my career, at the Smithsonian, the very first place I ever worked - so I think of TV Tempe as the prequel."

How did writing the episode compare to writing the novels?
"It's really different. For one thing, when I write a novel, I do it alone. I give my idea to my editors and they say, 'That's splendid' and then I go ahead and I write the book and I send it to them. That's not how writing a TV episode works. First you have to have your idea approved by the executive producers, your network, the studio, etcetera. Then you write a very lengthy outline, which I don't usually do for my novels. When that's approved up all the hierarchical levels, then you go and you break the story and it's a collective experience. You do it with the other writers, which is very different for me. I loved working in the writers' room, to me that was like a Brain Trust where we all bounced ideas of each other. Then you pitch it to Hart, and he liked it and made a few suggestions and then I wrote it. They changed a lot of it which was also a shock to me! It was a very positive experience but a very different experience from writing a novel."

Would you do it again?
"Absolutely, yes. I really did have a good time. I learned a lot, because it was the first one I had done. I figure I shouldn't waste all that newly acquired skill and maybe I should try my hand at a second one, if they let me!"

How does Booth and Brennan’s relationship develop in the episode?
"They are getting along pretty well right now I think, they've started dating other people. I leave their character development pretty much to Hart and to the executive producers. I've got some interesting plot developments with some of the other characters in my story but not specifically Booth and Brennan."

What are your thoughts on a Booth/Brennan romance?
"I just think when you do the deed, you're done. If we look at other shows, like X-Files or Moonlighting, to me that speaks the beginning of the end. They play so well at the chemistry. From the very beginning - the day Emily auditioned - the chemistry between them has been so good that I think it's better to keep that simmering."

The show just celebrated it’s 100th episode. How do you see the longevity?
"I think we should go to 1000 episodes! But what do I know?! Everything I hear is that we're going strong. We've been picked up for the sixth season, of course, and hopefully we can go several more beyond that."

Will we see you back in front of the camera again?
"Every time I'm out there Hart and I talk about it. I actually had a whole lot of fun doing it. I was initially kind of reluctant to appear on camera and Hart said, 'Well I'll write a part and if you don't want to do it, we'll cast it.' I was still fairly reluctant and then he told me David Duchovny was directing, so I said, 'Oh yes, I’m on board!' And I turned out having a really good time. So yes, I would like to do another one. They may have created a monster when they let me go in front of the camera! It was also the first episode that Ryan O'Neal appeared in."

Is it true you are writing a young adult novel series now?
"Yes, that is true. The first in the series, which is called Virals, will be out in November and it will follow 14-year-old Tori Brennan and her friends. Tori is the great-niece of Temperance Brennan."

When is the next Tempe book out?
"The next book will be out on August 24. It's called Spider Bones. It draws on my experience of consulting for our central lab in Honolulu for the identification of our war dead. It's called JPAC – the Joint POW/MIA Accounting Command. All of our war dead from South East Asia, Korea, WWII are identified there. Tempe will be going to Honolulu to straighten out a mix-up in an ID back in 1968."